我已经创建了一个脚本,以查看我们管理的PC上是否有任何活动(我已经在C#中创建了一个每隔5分钟检查一次活动的程序)。数据库如下所示:
服务器
readip, time(datetime), user, computeruse (int, 0=no 1=yes), ID
我已经有一个cronjob运行每天后创建一定比例的计算机使用。但是,如果客户的计算机已关闭,则不会被计算在内。
有没有办法检查在一段时间内是否没有新的行添加到数据库中?
我的代码是:
'$result2 = mysql_query("SELECT * FROM server WHERE serverip >='$ipfrom' AND serverip<='$ipto' AND DATE(time) = CURDATE() GROUP BY serverip ORDER BY time");
while($row2 = mysql_fetch_array($result2)) {
$serverip = $row2['serverip'];
$queryfornumrowsno = mysql_query("SELECT * From server WHERE serverip = '$serverip'") or die(mysql_error());
$numrowstotal = mysql_num_rows($queryfornumrowsno) . ' ';
$queryfornumrowsyes = mysql_query("SELECT * FROM server WHERE serverip = '$serverip' AND computeruse = 'Yes'");
$numrowsyes = mysql_num_rows($queryfornumrowsyes);
$percentage = $numrowsyes * 100 / $numrowstotal;
$percentage = round($percentage);
$percentagetotal[] = $percentage;
$datenow = $row2['time'];
}
$totaalPercentage = 0;
foreach( $percentagetotal as $totaal )
{
$totaalPercentage += $totaal;
}
$percentagecount = count($percentagetotal);
if($percentagecount == "0"){
$totaal = "0";
}
else{
$totaal = $totaalPercentage / $percentagecount;
}
echo $datenow . ' @ ' . $totaal . '% van ' . $lokaal . '<br />';
if($datenow){
}
抱歉我的英语不好,不是我的母语。
解决方案:
include 'connect.php';
$result = mysql_query("SELECT * FROM iprange");
while($row = mysql_fetch_array($result)) {
$ipfrom = $row['iprangefrom'];
$lokaal = $row['lokaal'];
$ipto = $row['iprangeto'];
$ipfrom = ip2long($ipfrom);
$ipto = ip2long($ipto);
$listpc = 0;
$result = mysql_query("SELECT * FROM server WHERE serverip >='$ipfrom' AND serverip<='$ipto' AND DATE(time) = CURDATE() AND computeruse = 'Yes'");
$countpc = mysql_query("SELECT * FROM server WHERE serverip >='$ipfrom' AND serverip<='$ipto' AND DATE(time) = CURDATE() GROUP BY serverip ORDER BY time") or die(mysql_error());
$countpcrows = mysql_num_rows($countpc);
while($row = mysql_fetch_array($result)) {
$listpc = $listpc + 1;
}
echo $countpcrows . ' ' . $listpc . '<br />';
$percentage = $listpc / 84 * 100 / $countpcrows;
//84 = 5 minutes.
echo round($percentage) . '%';
}
答案 0 :(得分:0)
要获取过去10分钟内没有活动的服务器列表: -
SELECT a.serverip
FROM
(
SELECT DISTINCT serverip
FROM server
WHERE serverip >='$ipfrom'
AND serverip<='$ipto'
) a
LEFT OUTER JOIN
(
SELECT DISTINCT serverip
FROM server
WHERE serverip >='$ipfrom'
AND serverip<='$ipto'
AND time > DATE_ADD(CURDATE(), INTERVAL -10 MINUTE)
) b
ON a.serverip = b.serverip
WHERE b.serverip IS NULL
第一个子查询获取您感兴趣的范围内的服务器列表。第二个查询获取过去10分钟内具有任何活动的服务器。 LEFT JOIN将获得2的组合,包括那些在过去10分钟内没有活动的服务器。然后,WHERE子句将排除除最近10分钟内有任何活动的那些以外的所有内容。
基于此,您应该能够计算百分比。您是希望百分比作为所有服务器的数量,还是仅仅是您感兴趣的范围内的服务器数量?
假设您感兴趣的范围内所有服务器的百分比: -
SELECT (COUNT(DISTINCT a.serverip) / c.all_server) * 100 AS percentage_not_used
FROM server a
CROSS JOIN
(
SELECT COUNT(*) AS all_server
FROM server
WHERE serverip >='$ipfrom'
AND serverip <='$ipto'
) c
LEFT OUTER JOIN
(
SELECT DISTINCT serverip
FROM server
WHERE serverip >='$ipfrom'
AND serverip<='$ipto'
AND time > DATE_ADD(CURDATE(), INTERVAL -10 MINUTE)
) b
ON a.serverip = b.serverip
WHERE a.serverip >='$ipfrom'
AND a.serverip <='$ipto'
AND b.serverip IS NULL
编辑 - 计算过去24小时内每台服务器使用的次数百分比(假设24小时内可以使用的最大值为84次): -
SELECT a.serverip, (COUNT(b.serverip) / 84) * 100 AS percentage_not_used
FROM server a
LEFT OUTER JOIN server b
ON a.serverip = b.serverip
AND b.serverip >='$ipfrom'
AND b.serverip<='$ipto'
AND b.time > DATE_ADD(CURDATE(), INTERVAL -24 HOUR)
GROUP BY a.serverip
加入服务器表对自己。表的第一次出现用于获取serverip(无论是否在过去24小时内使用),而第二次用于获取在过去24小时内使用它的次数(计数将忽略空值)。